13 July 2006
Commentary, Figure C6-1A. Tornadic Gust Wind Speed Corresponding to Annual
Probability of Occurrence, and the following publications:
FEMA 320 Taking Shelter from the Storm: Building a Safe Room Inside
FEMA 361 Design and Construction Guidance for Community Shelters.
FEMA National Performance Criteria for Tornado Shelters.
ROOF AND ATTIC CONSTRUCTION
Roofs should slope a minimum of 4:12 for maintainability, and to provide residential
scale to the neighborhood. Wood shingles and shakes are prohibited. Design roof
overhangs, gutters and downspouts, roofing materials, and attic ventilation in
accordance with roofing installation standards to conserve energy and reduce
maintenance costs. See UFC 3-190-04FA Roofing and Waterproofing, for additional
guidance. Roofs should have minimum eave overhangs of 30 cm (12 in), and gable
overhangs of 15 cm (6 in). Roofing material should comply with Energy Star
Attic power ventilation should be provided, when proven to be life-cycle cost effective.
Do not terminate exhaust fans or plumbing vents in attic, unless plumbing vents have air
admittance valves (AAV) that comply with IRC provisions.
Use sustainable, low maintenance finish materials, such as brick, integrally-colored
concrete masonry, integrally colored stucco, factory finished vinyl-clad steel, vinyl
siding, fiber-cement siding, and drainable exterior insulated finish systems. Avoid
materials requiring field finishing. Provide vapor barrier/diffusion retarder as required by
dew point analysis. Aluminum siding should not be used.
Provide windows that meet minimum egress requirements in NFPA 101, Life Safety
Code. Operable windows must be manually operated and lockable. Provide non-
ferrous screens for operable windows. Maximize amount of natural light in living areas.
Consider passive solar energy impact on heating and cooling loads when selecting,
sizing, and locating windows. Window energy performance should comply with Energy
Star recommendations. Tilt-in windows are recommended to facilitate cleaning by